html,body{
  width:100%;
  height:100%;
}
*{
  box-sizing: border-box;
}
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{margin:0;padding:0;}
li { display: block; list-style: none; }